Algodoo

make a set of circles that are the same , then make 5 horizontal rows, kinda like floors of a buildings with relatively thin boxes then make boxes on the sides and fix them to the horizontal ones, so its kinda like a building now, but you can toss it around, then pot 5 circles in each of the levels, they should be an equal distance from each other, and the wall above and below them. now spring them to the wall above and below them, and the circle directly beside them, make the springs the right strength so that they can stay in one place with out wobbling too much, now make it so the circles are each like, 4000 bouncy, then bring the entire unit to a high place, when you hit play, it will fall, hit the plane, the circles will hit each other or the wall and bounce away, hitting others and causing a chain reaction, they will go through the wall, no need to worry

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@z dub
any chance of you making a phunlet of that?